Abstract
ABSTRACT The induction kinetics of the transcriptional activities of interferon regulatory factor 1 (IRF-1), interleukin-1β-converting enzyme (ICE), and CPP32 by respiratory syncytial virus (RSV) infection of human type II alveolar epithelial cells (A549 cells) were analyzed semiquantitatively by reverse transcriptase PCR. The appearance of ICE and CPP32 protein in cell lysate was examined by Western blotting analysis. The induction of apoptosis by RSV infection was examined by the appearance of DNA fragmentation detected by terminal deoxynucleotidyltransferase-mediated dUTP-biotin nick end labeling. RSV moderately enhanced IRF-1 mRNA as early as 4 h after infection, and this enhancement lasted several hours. Following induction of the IRF-1 gene, ICE gene expression increased significantly, and an increase of ICE protein was observed in the RSV-infected cell lysate. These increments were observed in cells treated with live RSV but not in cells treated with inactivated RSV or control antigen. However, no infection-specific increase of CPP32 gene expression or the protein was observed. No nucleosomal fragmentation was observed in RSV-infected cells during the whole course of infection, despite the appearance of extensive cytopathic change and cell death. These observations suggest that RSV infection of human alveolar epithelial cells induces the ICE gene and its protein as a result of increased IRF-1 induction but that the increased ICE was insufficient to cause apoptosis in the RSV-infected cells. ICE might not be able to activate CPP32, which is thought to be the more important protease for apoptosis.
Bibliography
Takeuchi, R., Tsutsumi, H., Osaki, M., Haseyama, K., Mizue, N., & Chiba, S. (1998). Respiratory Syncytial Virus Infection of Human Alveolar Epithelial Cells Enhances Interferon Regulatory Factor 1 and Interleukin-1β-Converting Enzyme Gene Expression but Does Not Cause Apoptosis. Journal of Virology, 72(5), 4498â4502.
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Dates
Type | When |
---|---|
Created | 5 years, 7 months ago (Dec. 31, 2019, 1:13 p.m.) |
Deposited | 3 years, 5 months ago (March 4, 2022, 9:55 p.m.) |
Indexed | 4 months, 1 week ago (April 19, 2025, 12:16 a.m.) |
Issued | 27 years, 3 months ago (May 1, 1998) |
Published | 27 years, 3 months ago (May 1, 1998) |
Published Print | 27 years, 3 months ago (May 1, 1998) |
@article{Takeuchi_1998, title={Respiratory Syncytial Virus Infection of Human Alveolar Epithelial Cells Enhances Interferon Regulatory Factor 1 and Interleukin-1β-Converting Enzyme Gene Expression but Does Not Cause Apoptosis}, volume={72}, ISSN={1098-5514}, url={http://dx.doi.org/10.1128/jvi.72.5.4498-4502.1998}, DOI={10.1128/jvi.72.5.4498-4502.1998}, number={5}, journal={Journal of Virology}, publisher={American Society for Microbiology}, author={Takeuchi, Ryoh and Tsutsumi, Hiroyuki and Osaki, Masaya and Haseyama, Keiji and Mizue, Nobuo and Chiba, Shunzo}, year={1998}, month=may, pages={4498–4502} }